Dedusting fog gun machine for building construction
By introducing a sliding sealing plate and a spiral guide plate into the dust suppression fog cannon used in construction, the problem of easy nozzle clogging is solved, the nozzle is protected and the water mist is effectively sprayed, and the service life and dust suppression effect of the equipment are improved.
Patent Information
- Application Number
- CN202511158652.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-19
- Publication Date
- 2025-12-02
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
Existing fog cannons are prone to nozzle clogging by dust during construction, leading to nozzle damage, and lack effective protective devices.
A dust suppression fog cannon for construction is designed, comprising a fixed base, a guide air duct, a nozzle, and an anti-clogging component. Multiple sets of sliding sealing plates prevent dust from entering the nozzle, and water pressure drives the sealing plates to open and close, combined with a spiral guide plate to achieve spiral spraying of water mist.
It effectively prevents nozzle clogging, ensures flexible adjustment of the water mist spray range and extends the water mist suspension time, thereby improving the service life of the equipment and dust removal efficiency.
Smart Images

Figure CN121041801A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of building construction technology, specifically to a dust suppression fog cannon for building construction. Background Technology
[0002] Construction refers to the production activities during the implementation phase of a project. It is the process of building various types of buildings, or the process of turning the lines on the design drawings into physical objects at a designated location. During construction, a large amount of dust is inevitably generated. In the prior art, Chinese invention patent CN119034395A discloses a dust removal device for construction, including a support frame, a guide duct, and a nozzle adjustment assembly. This invention relates to the field of dust removal device technology. A nozzle adjustment assembly is installed at the front opening of the guide duct. A control motor rotates a control gear, which in turn drives a control ring. Multiple first rotating gears rotate synchronously under the drive of the control internal teeth, causing the active bevel gear to rotate synchronously. The driven bevel gear and the second rotating gear then rotate. The second rotating gear, through its rotating teeth, causes the rotating ring to flip, thereby rotating the atomizing nozzle. This achieves the technical effect of changing the spray angle of the atomizing nozzle. By adjusting the spray angle of the atomizing nozzle, the water mist spray range can be changed without directly moving the device, saving time and effort. Among the above technologies, the effect of changing the spray angle of the atomizing nozzle is that the spray range of water mist can be changed without directly moving the device by adjusting the spray angle of the atomizing nozzle. However, existing fog cannons do not have protective devices, and the nozzles are easily clogged by dust, causing nozzle damage. Summary of the Invention
[0003] The purpose of this invention is to provide a dust suppression fog cannon for construction, so as to solve the problems mentioned in the background art.
[0004] To achieve the above objectives, the present invention provides the following technical solution: A dust suppression fog cannon for construction work, comprising: A fixed base is provided, on which a guide air duct is installed, and a support assembly is provided between the upper end of the fixed base and the guide air duct for supporting the guide air duct; A dust removal assembly is installed at the end of the air guide duct, and the dust removal assembly includes multiple sets of nozzles installed at the end of the air guide duct; An anti-clogging component, installed at the end of each of the nozzles, is used to prevent dust from entering the inside of the nozzles. The anti-clogging component includes multiple sets of slidingly arranged sealing plates.
[0005] Furthermore, the support assembly includes a turntable rotatably mounted at the center of the upper end of the fixed base, and a support frame is provided between the turntable and the air guide duct; One end of the support frame is fixedly connected to the upper end of the turntable, and the other end of the support frame is hinged to the air guide duct. The support assembly also includes a telescopic cylinder disposed between the turntable and the air guide duct. Through the cooperation of the telescopic cylinder and the support frame, the air guide duct can be rotated and its angle adjusted.
[0006] Furthermore, a water tank is provided inside the fixed base, a water pump is connected to the outlet of the water tank, and a water inlet pipe is connected to the outlet of the water pump. Each of the nozzles is connected to a connecting pipe at its end, and the outlet of the water inlet pipe is connected to each of the nozzles through the air guide duct.
[0007] Furthermore, the anti-clogging component also includes a closed sleeve disposed at the end of the nozzle away from the connecting pipe, and the closed sleeve has a clearance groove inside; An adjusting plate is rotatably provided inside the relief groove, and the sealing plate is disposed inside the relief groove and between the adjusting plate.
[0008] Furthermore, the interior of the clearance groove has multiple sets of first guide grooves arranged in a circular pattern, and each of the sealing plates is equipped with a guide rod at a position corresponding to the first guide groove. The sealing plates move closer to or further away from each other through the cooperation of the corresponding first guide groove and the guide rod. The adjusting disc has a second guide groove with an arc shape at the position of each guide rod, and the end of the guide rod away from the first guide groove is inserted into the interior of the second guide groove.
[0009] Furthermore, a sliding groove is provided on the inner side wall of the clearance groove, a slider is installed on the adjusting plate at the position corresponding to the sliding groove, and a fifth return spring is provided between one side wall of the slider and the inner wall of the sliding groove. The nozzle has a drive assembly inside for driving the adjustment disc to rotate.
[0010] Furthermore, the drive assembly includes a first receiving groove formed in the inner wall of the nozzle, a pressing plate is inserted into the inside of the first receiving groove, and a first return spring is provided between the first receiving groove and the pressing plate; A first airbag is provided between the first storage groove and the extrusion plate, and a second airbag is provided between the other side wall of the slider and the inner wall of the groove. A first through hole is provided on the inner wall of the connecting pipe corresponding to the first airbag and the second airbag. An exhaust pipe is provided inside the first through hole, and the two ends of the exhaust pipe are respectively connected to the first through hole and the second airbag.
[0011] Furthermore, a limiting groove is formed on the side wall of the extrusion plate, and a second storage groove is formed on the side wall of the first storage groove at the position corresponding to the limiting groove. A limiting block is inserted into the interior of the second storage groove, and a third reset spring is provided between the side wall of the limiting block and the inner wall of the second storage groove. A fixing frame is installed inside the nozzle at a position corresponding to the limiting block. A first rotating shaft is installed at one end of the fixing frame, and a rotating sleeve is fitted at one end of the first rotating shaft. A groove is provided at the end of the first rotating shaft corresponding to the position of the rotating sleeve. A second rotating shaft is rotatably arranged inside the groove, and a second return spring is provided between the second rotating shaft and the rotating sleeve.
[0012] Furthermore, the outer surface of the rotating sleeve is equipped with multiple sets of fan blades arranged in a circular pattern, and each fan blade is connected to a collar at its end. The outer surface of the collar is provided with a groove, and the inner sidewall of the nozzle is provided with a third receiving groove at the position corresponding to the groove. An insert plate is inserted into the third receiving groove, and a fourth return spring is provided between the end of the insert plate and the inner wall of the third receiving groove. The insert plate is elastically disposed inside the third receiving groove by the fourth return spring. A second through hole is provided between the third storage slot and the second storage slot. A pull rope is provided inside the second through hole, and the two ends of the pull rope are respectively connected to the end of the insert plate and the end of the limiting block.
[0013] Furthermore, a nozzle is connected to the end of the closed sleeve, and a spiral guide plate is provided inside the nozzle.
[0014] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention uses multiple sets of sliding sealing plates to seal the end of the nozzle to prevent dust from entering. During use, the water pressure inside the nozzle will press against the squeezing plate. When the squeezing plate is pressed against by the water pressure, the gas inside the first airbag is discharged into the second airbag through the exhaust pipe. The second airbag expands and pushes the slider to rotate along the slide groove. When rotating, it drives the adjustment plate to rotate. Then, through the cooperation of the first guide groove and the second guide groove, the multiple sets of sealing plates move away synchronously, realizing the connection between the nozzle and the spray nozzle, so that the water is sprayed out and atomized. 2. When water enters the connecting pipe, the water pressure pushes the fan blade to one side, and the fan blade drives the collar to move. At this time, the insert plate and the sink are misaligned. When misaligned, the elastically set limit block is no longer limited, and the extrusion plate held by the water pressure moves up and the elastically set limit block is inserted into the limit groove to complete the limit of the extrusion plate and prevent multiple sealing plates from getting close to each other when the water pressure drops. 3. The spiral guide plate inside the nozzle allows water to be sprayed out in a spiral pattern from inside the nozzle, forming a spiral trajectory and prolonging the suspension time of the water mist. Attached Figure Description
[0015] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a schematic diagram showing the connection between the nozzle and the enclosed sleeve structure of the present invention; Figure 3 This is a schematic cross-sectional view of the nozzle and enclosed sleeve structure of the present invention; Figure 4 for Figure 3 Enlarged schematic diagram of the structure at point A in the middle; Figure 5 for Figure 4 Enlarged schematic diagram of the structure at point B; Figure 6 for Figure 4 Enlarged schematic diagram of the structure at point C; Figure 7 for Figure 6 Enlarged schematic diagram of the structure at point D; Figure 8 This is an exploded view of the closed sleeve structure of the present invention.
[0016] In the diagram: 1. Fixed base; 2. Water tank; 3. Water pump; 4. Telescopic cylinder; 5. Water inlet pipe; 6. Guide air duct; 7. Support frame; 8. Connecting pipe; 9. Turntable; 10. Nozzle; 11. Sealing sleeve; 12. Nozzle; 13. Spiral guide plate; 14. Sealing plate; 15. Extrusion plate; 16. First collection slot; 17. First airbag; 18. First return spring; 19. Fixed frame; 20. Collar; 21. Fan blade; 22. First rotating shaft; 23. Groove; 24. Second rotating shaft; 25. Second return spring. 25. Rotating sleeve; 26. First through hole; 27. Exhaust pipe; 28. Limiting groove; 29. Second storage groove; 30. Limiting block; 31. Third reset spring; 32. Second through hole; 33. Pull rope; 34. Third storage groove; 35. Fourth reset spring; 36. Insert plate; 37. Sinking groove; 38. Leaving groove; 39. First guide groove; 40. Guide rod; 41. Adjusting plate; 42. Second guide groove; 43. Sliding block; 44. Fifth reset spring; 45. Slide groove; 46. Second airbag; 47. Detailed Implementation
[0017] To more clearly illustrate the overall concept of the present invention, a detailed description will be provided below with reference to the accompanying drawings and examples. Example 1
[0018] Please see Figures 1 to 8The present invention provides a technical solution: a dust suppression fog cannon for construction, comprising: a fixed base 1, on which a guide air duct 6 is installed, and a support assembly is provided between the upper end of the fixed base 1 and the guide air duct 6 for supporting the guide air duct 6; A dust removal assembly is installed at the end of the air guide duct 6, and the dust removal assembly includes multiple sets of nozzles 10 installed at the end of the air guide duct 6; An anti-clogging component is installed at the end of each of the nozzles 10 to prevent dust from entering the inside of the nozzles 10. The anti-clogging component includes multiple sets of slidingly arranged sealing plates 14. The support components enable the support and adjustment of the air duct 6. When dust removal and suppression are required at the construction site, the dust removal components at the end of the air duct 6 can be activated. When the dust removal components are not in operation, the anti-clogging components can seal the dust removal components to prevent dust in the air from entering the dust removal components. Example 2
[0019] like Figure 1 As shown, the dust suppression fog cannon for construction disclosed in Embodiment 2 of the present invention has a structure that is basically the same as that in Embodiment 1, except that: The support assembly includes a turntable 9 rotatably mounted at the center of the upper end of the fixed base 1, and a support frame 7 is provided between the turntable 9 and the air duct 6. One end of the support frame 7 is fixedly connected to the upper end of the turntable 9, and the other end of the support frame 7 is hinged to the air guide duct 6. The support assembly also includes a telescopic cylinder 4 disposed between the turntable 9 and the air guide duct 6. Through the cooperation of the telescopic cylinder 4 and the support frame 7, the air guide duct 6 can be rotated and its angle adjusted. The fixed base 1 is equipped with a water tank 2 inside, and the water outlet of the water tank 2 is connected to a water pump 3, and the water outlet of the water pump 3 is connected to a water inlet pipe 5. Each of the nozzles 10 is connected to a connecting pipe 8 at its end, and the outlet of the water inlet pipe 5 is connected to each of the nozzles 10 through the air guide duct 6. The turntable 9 and the support frame 7 work together to support and adjust the direction of the air guide duct 6, while the telescopic cylinder 4 can adjust the angle of the air guide duct 6. Example 3
[0020] like Figures 2-3 as well as Figure 8 As shown, the dust suppression fog cannon for construction disclosed in Embodiment 3 of the present invention has a structure that is basically the same as that in Embodiment 2, except that: The anti-clogging component also includes a closed sleeve 11 disposed at the end of the nozzle 10 away from the connecting pipe 8, and the closed sleeve 11 has a clearance groove 39 inside. An adjusting plate 42 is rotatably provided inside the relief groove 39, and the sealing plate 14 is disposed inside the relief groove 39 and between the adjusting plate 42; The interior of the clearance groove 39 has multiple sets of first guide grooves 40 arranged in a circular pattern. Each of the sealing plates 14 is equipped with a guide rod 41 at a position corresponding to the first guide groove 40. Each of the sealing plates 14 moves closer to or further away from each other through the cooperation of the first guide groove 40 and the guide rod 41. The adjustment disc 42 is provided with a second guide groove 43 in an arc shape at the position of each guide rod 41, and the end of the guide rod 41 away from the first guide groove 40 is inserted into the interior of the second guide groove 43. The inner sidewall of the clearance groove 39 is provided with a sliding groove 46, and the adjusting plate 42 is equipped with a slider 44 at the position corresponding to the sliding groove 46. A fifth return spring 45 is provided between one sidewall of the slider 44 and the inner wall of the sliding groove 46. By adjusting the rotation of the disc 42 and the limiting cooperation of the second guide groove 43 and the first guide groove 40, the multiple sets of sealing plates 14 can move closer or further apart. When the multiple sets of sealing plates 14 move closer together, they form a circular structure that separates the nozzle 12 and the spray head 10, preventing dust from entering the inside of the spray head 10 and causing it to become clogged. Example 4
[0021] like Figure 4 As shown, the dust suppression fog cannon for construction disclosed in Embodiment 4 of the present invention has a structure that is basically the same as that in Embodiment 3, except that: The nozzle 10 is equipped with a drive assembly for driving the adjustment disk 42 to rotate; The drive assembly includes a first receiving groove 16 formed in the inner wall of the nozzle 10, a pressing plate 15 is inserted into the first receiving groove 16, and a first return spring 18 is provided between the first receiving groove 16 and the pressing plate 15. A first airbag 17 is provided between the first storage groove 16 and the extrusion plate 15, and a second airbag 47 is provided between the other side wall of the slider 44 and the inner wall of the slide groove 46. A first through hole 27 is provided on the inner wall of the connecting pipe 8 between the first airbag 17 and the second airbag 47. An exhaust pipe 28 is provided inside the first through hole 27, and the two ends of the exhaust pipe 28 are respectively connected to the first through hole 27 and the second airbag 47. As the multiple sets of sealing plates 14 approach each other, the end of the nozzle 10 is sealed. When the water pump 3 is started to inject water into each connecting pipe 8, the water pressure inside the nozzle 10 will press against the squeezing plate 15. When the squeezing plate 15 is pressed against by the water pressure, the gas inside the first airbag 17 is discharged into the second airbag 47 through the exhaust pipe 28. The second airbag 47 expands and pushes the slider 44 to rotate along the slide groove 46. When rotating, it drives the adjusting plate 42 to rotate. Then, through the cooperation of the first guide groove 40 and the second guide groove 43, the multiple sets of sealing plates 14 move away synchronously, realizing the connection between the nozzle 10 and the nozzle 12. Example 5
[0022] like Figures 4-7 As shown, the dust suppression fog cannon for construction disclosed in Embodiment 5 of the present invention has a structure that is basically the same as that in Embodiment 4, except that: The side wall of the extrusion plate 15 is provided with a limiting groove 29, and the side wall of the first storage groove 16 is provided with a second storage groove 30 at the position corresponding to the limiting groove 29. A limiting block 31 is inserted into the interior of the second storage groove 30, and a third return spring 32 is provided between the side wall of the limiting block 31 and the inner wall of the second storage groove 30. A fixing frame 19 is installed inside the nozzle 10 at a position corresponding to the limiting block 31. A first rotating shaft 22 is installed at one end of the fixing frame 19, and a rotating sleeve 26 is sleeved on one end of the first rotating shaft 22. A groove 23 is provided at the end of the first rotating shaft 22 corresponding to the position of the rotating sleeve 26. A second rotating shaft 24 is rotatably disposed inside the groove 23. A second return spring 25 is disposed between the second rotating shaft 24 and the rotating sleeve 26. The outer surface of the rotating sleeve 26 is equipped with multiple sets of fan blades 21 arranged in a circular pattern, and each fan blade 21 is connected to a collar 20 at its end. The outer surface of the collar 20 is provided with a groove 38, and the inner sidewall of the nozzle 10 is provided with a third receiving groove 35 at the position corresponding to the groove 38. An insert plate 37 is inserted into the third receiving groove 35, and a fourth return spring 36 is provided between the end of the insert plate 37 and the inner wall of the third receiving groove 35. The insert plate 37 is elastically disposed inside the third receiving groove 35 by the fourth return spring 36. A second through hole 33 is provided between the third storage slot 35 and the second storage slot 30. A pull rope 34 is provided inside the second through hole 33. The two ends of the pull rope 34 are respectively connected to the end of the insert plate 37 and the end of the limiting block 31. When water enters the connecting pipe 8, the water pressure pushes the fan blade 21 to one side, and the fan blade 21 drives the collar 20 to move. At this time, the insert plate 37 and the sink 38 are misaligned. When misaligned, the elastically set limiting block 31 is no longer limited, and the squeezing plate 15 held by the water pressure moves upward and the elastically set limiting block 31 is inserted into the limiting groove 29 to complete the limiting of the squeezing plate 15 and prevent multiple sets of sealing plates 14 from approaching each other when the water pressure drops.
[0023] The specific solution is as follows: by cooperating with the water pump 3 and the water inlet pipe 5, the water inside the water tank 2 is discharged into each connecting pipe 8. Then, through the connecting pipe 8 and the nozzle 10 connected to the connecting pipe 8, the water is sprayed to the end of the guide air duct 6. Then, the water is atomized and sprayed out through the guide air duct 6 to achieve the purpose of dust removal and dust reduction at the construction site. When not in use, the extrusion plate 15 is not held by water pressure. At this time, the slider 44 drives the adjustment plate 42 to rotate under the action of the fifth return spring 45. When the adjustment plate 42 rotates, with the cooperation of the first guide groove 40 and the second guide groove 43, it drives multiple sets of sealing plates 14 to move closer to each other, thereby sealing the end of the nozzle 10 and preventing dust from entering.
[0024] This invention is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this invention should be included within the scope of protection of this invention.
Claims
1. A dust suppression fog cannon for construction, characterized in that, include: A fixed base (1) is provided, on which a guide air duct (6) is installed, and a support assembly is provided between the upper end of the fixed base (1) and the guide air duct (6) for supporting the guide air duct (6). A dust removal assembly is installed at the end of the air guide duct (6), and the dust removal assembly includes multiple sets of nozzles (10) installed at the end of the air guide duct (6). An anti-clogging component is installed at the end of each of the nozzles (10) to prevent dust from entering the inside of the nozzles (10). The anti-clogging component includes multiple sets of slidingly arranged sealing plates (14).
2. The dust suppression fog cannon for construction as described in claim 1, characterized in that, The support assembly includes a turntable (9) rotatably mounted at the center of the upper end of the fixed base (1), and a support frame (7) is provided between the turntable (9) and the air guide duct (6). One end of the support frame (7) is fixedly connected to the upper end of the turntable (9), and the other end of the support frame (7) is hinged to the air guide duct (6); The support assembly also includes a telescopic cylinder (4) disposed between the turntable (9) and the air guide duct (6). Through the cooperation of the telescopic cylinder (4) and the support frame (7), the air guide duct (6) can be rotated and its angle adjusted.
3. The dust suppression fog cannon for construction as described in claim 1, characterized in that, The fixed base (1) is equipped with a water tank (2), and the outlet of the water tank (2) is connected to a water pump (3), and the outlet of the water pump (3) is connected to an inlet pipe (5). Each of the nozzles (10) is connected to a connecting pipe (8) at its end, and the outlet of the water inlet pipe (5) is connected to each of the nozzles (10) through the guide air duct (6).
4. The dust suppression fog cannon for construction as described in claim 3, characterized in that, The anti-clogging component also includes a closed sleeve (11) disposed at the end of the nozzle (10) away from the connecting pipe (8), and the closed sleeve (11) has a relief groove (39) inside. An adjusting plate (42) is rotatably provided inside the relief groove (39), and the sealing plate (14) is disposed inside the relief groove (39) and between the adjusting plate (42).
5. The dust suppression fog cannon for construction as described in claim 4, characterized in that, The interior of the clearance groove (39) has multiple sets of first guide grooves (40) arranged in a circular pattern. Each of the sealing plates (14) is equipped with a guide rod (41) at a position corresponding to the first guide groove (40). Each of the sealing plates (14) moves closer to or further away from each other through the cooperation of the first guide groove (40) and the guide rod (41). The adjusting disc (42) has a second guide groove (43) with an arc-shaped structure at the position corresponding to each of the guide rods (41), and the end of the guide rod (41) away from the first guide groove (40) is inserted into the interior of the second guide groove (43).
6. The dust suppression fog cannon for construction as described in claim 5, characterized in that, The inner sidewall of the clearance groove (39) is provided with a sliding groove (46), and the adjusting plate (42) is equipped with a slider (44) at the position corresponding to the sliding groove (46), and a fifth return spring (45) is provided between one sidewall of the slider (44) and the inner wall of the sliding groove (46). The nozzle (10) is equipped with a drive assembly for driving the adjustment disc (42) to rotate.
7. The dust suppression fog cannon for construction as described in claim 6, characterized in that, The drive assembly includes a first receiving groove (16) formed on the inner wall of the nozzle (10), a pressing plate (15) is inserted into the first receiving groove (16), and a first return spring (18) is provided between the first receiving groove (16) and the pressing plate (15). A first airbag (17) is provided between the first storage groove (16) and the extrusion plate (15), and a second airbag (47) is provided between the other side wall of the slider (44) and the inner wall of the slide groove (46). A first through hole (27) is provided on the inner wall of the connecting pipe (8) between the first airbag (17) and the second airbag (47). An exhaust pipe (28) is provided inside the first through hole (27), and the two ends of the exhaust pipe (28) are respectively connected to the first through hole (27) and the second airbag (47).
8. The dust suppression fog cannon for construction as described in claim 7, characterized in that, The side wall of the extrusion plate (15) is provided with a limiting groove (29), and the side wall of the first storage groove (16) is provided with a second storage groove (30) at the position corresponding to the limiting groove (29). A limiting block (31) is inserted into the inside of the second storage groove (30), and a third return spring (32) is provided between the side wall of the limiting block (31) and the inner wall of the second storage groove (30). A fixing frame (19) is installed inside the nozzle (10) at a position corresponding to the limiting block (31). A first rotating shaft (22) is installed at one end of the fixing frame (19), and a rotating sleeve (26) is sleeved on one end of the first rotating shaft (22). A groove (23) is provided at the end of the first rotating shaft (22) corresponding to the position of the rotating sleeve (26). A second rotating shaft (24) is rotatably arranged inside the groove (23). A second return spring (25) is provided between the second rotating shaft (24) and the rotating sleeve (26).
9. The dust suppression fog cannon for construction as described in claim 8, characterized in that, The outer surface of the rotating sleeve (26) is equipped with a plurality of circumferentially distributed fan blades (21), and each fan blade (21) is connected to a collar (20) at its end. The outer surface of the collar (20) is provided with a groove (38), and the inner sidewall of the nozzle (10) is provided with a third receiving groove (35) at the position corresponding to the groove (38). A plate (37) is inserted into the third receiving groove (35), and a fourth return spring (36) is provided between the end of the plate (37) and the inner wall of the third receiving groove (35). The plate (37) is elastically disposed inside the third receiving groove (35) by the fourth return spring (36). A second through hole (33) is provided between the third storage slot (35) and the second storage slot (30). A pull rope (34) is provided inside the second through hole (33). The two ends of the pull rope (34) are respectively connected to the end of the insert plate (37) and the end of the limiting block (31).
10. The dust suppression fog cannon for construction as described in claim 4, characterized in that, The end of the closed sleeve (11) is connected to a nozzle (12), and a spiral guide plate (13) is provided inside the nozzle (12).
Citation Information
Patent Citations
Building construction dust removal device
CN119034395A